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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "webkit/fileapi/file_system_path_manager.h"
#include "base/file_util.h"
#include "base/file_util_proxy.h"
#include "base/rand_util.h"
#include "base/logging.h"
#include "base/scoped_callback_factory.h"
#include "base/stringprintf.h"
#include "base/string_util.h"
#include "base/utf_string_conversions.h"
#include "googleurl/src/gurl.h"
#include "third_party/WebKit/WebKit/chromium/public/WebCString.h"
#include "third_party/WebKit/WebKit/chromium/public/WebFileSystem.h"
#include "third_party/WebKit/WebKit/chromium/public/WebSecurityOrigin.h"
#include "webkit/glue/webkit_glue.h"
// We use some of WebKit types for conversions between storage identifiers
// and origin URLs.
using WebKit::WebFileSystem;
using WebKit::WebSecurityOrigin;
using WebKit::WebString;
using base::FileUtilProxy;
using base::PlatformFileError;
namespace fileapi {
const FilePath::CharType FileSystemPathManager::kFileSystemDirectory[] =
FILE_PATH_LITERAL("FileSystem");
const char FileSystemPathManager::kPersistentName[] = "Persistent";
const char FileSystemPathManager::kTemporaryName[] = "Temporary";
namespace {
// Restricted names.
// http://dev.w3.org/2009/dap/file-system/file-dir-sys.html#naming-restrictions
static const char* const kRestrictedNames[] = {
"con", "prn", "aux", "nul",
"com1", "com2", "com3", "com4", "com5", "com6", "com7", "com8", "com9",
"lpt1", "lpt2", "lpt3", "lpt4", "lpt5", "lpt6", "lpt7", "lpt8", "lpt9",
};
// Restricted chars.
static const FilePath::CharType kRestrictedChars[] = {
'/', '\\', '<', '>', ':', '?', '*', '"', '|',
};
inline std::string FilePathStringToASCII(
const FilePath::StringType& path_string) {
#if defined(OS_WIN)
return WideToASCII(path_string);
#elif defined(OS_POSIX)
return path_string;
#endif
}
} // anonymous namespace
FileSystemPathManager::FileSystemPathManager(
const FilePath& data_path,
bool is_incognito,
bool allow_file_access_from_files)
: base_path_(data_path.Append(kFileSystemDirectory)),
is_incognito_(is_incognito),
allow_file_access_from_files_(allow_file_access_from_files) {
}
bool FileSystemPathManager::GetFileSystemRootPath(
const GURL& origin_url, fileapi::FileSystemType type,
FilePath* root_path, std::string* name) const {
// TODO(kinuko): should return an isolated temporary file system space.
if (is_incognito_)
return false;
if (!IsAllowedScheme(origin_url))
return false;
std::string storage_identifier = GetStorageIdentifierFromURL(origin_url);
switch (type) {
case fileapi::kFileSystemTypeTemporary:
if (root_path)
*root_path = base_path_.AppendASCII(storage_identifier)
.AppendASCII(kTemporaryName);
if (name)
*name = storage_identifier + ":" + kTemporaryName;
return true;
case fileapi::kFileSystemTypePersistent:
if (root_path)
*root_path = base_path_.AppendASCII(storage_identifier)
.AppendASCII(kPersistentName);
if (name)
*name = storage_identifier + ":" + kPersistentName;
return true;
}
LOG(WARNING) << "Unknown filesystem type is requested:" << type;
return false;
}
bool FileSystemPathManager::CheckValidFileSystemPath(
const FilePath& path) const {
// Any paths that includes parent references are considered invalid.
if (path.ReferencesParent())
return false;
// The path should be a child of the profile FileSystem path.
FilePath relative;
if (!base_path_.AppendRelativePath(path, &relative))
return false;
// The relative path from the profile FileSystem path should at least
// contains two components, one for storage identifier and the other for type
std::vector<FilePath::StringType> components;
relative.GetComponents(&components);
if (components.size() < 2)
return false;
// The second component of the relative path to the root directory
// must be kPersistent or kTemporary.
if (!IsStringASCII(components[1]))
return false;
std::string ascii_type_component = FilePathStringToASCII(components[1]);
if (ascii_type_component != kPersistentName &&
ascii_type_component != kTemporaryName)
return false;
return true;
}
bool FileSystemPathManager::GetOriginFromPath(
const FilePath& path, GURL* origin_url) {
DCHECK(origin_url);
FilePath relative;
if (!base_path_.AppendRelativePath(path, &relative)) {
// The path should be a child of the profile's FileSystem path.
return false;
}
std::vector<FilePath::StringType> components;
relative.GetComponents(&components);
if (components.size() < 2) {
// The relative path should at least contain storage identifier and type.
return false;
}
WebSecurityOrigin web_security_origin =
WebSecurityOrigin::createFromDatabaseIdentifier(
webkit_glue::FilePathStringToWebString(components[0]));
*origin_url = GURL(web_security_origin.toString());
// We need this work-around for file:/// URIs as
// createFromDatabaseIdentifier returns empty origin_url for them.
if (allow_file_access_from_files_ && origin_url->spec().empty() &&
components[0].find(FILE_PATH_LITERAL("file")) == 0) {
*origin_url = GURL("file:///");
return true;
}
return IsAllowedScheme(*origin_url);
}
bool FileSystemPathManager::IsAllowedScheme(const GURL& url) const {
// Basically we only accept http or https. We allow file:// URLs
// only if --allow-file-access-from-files flag is given.
return url.SchemeIs("http") || url.SchemeIs("https") ||
(url.SchemeIsFile() && allow_file_access_from_files_);
}
bool FileSystemPathManager::IsRestrictedFileName(
const FilePath& filename) const {
if (filename.value().size() == 0)
return false;
if (IsWhitespace(filename.value()[filename.value().size() - 1]) ||
filename.value()[filename.value().size() - 1] == '.')
return true;
std::string filename_lower = StringToLowerASCII(
FilePathStringToASCII(filename.value()));
for (size_t i = 0; i < arraysize(kRestrictedNames); ++i) {
// Exact match.
if (filename_lower == kRestrictedNames[i])
return true;
// Starts with "RESTRICTED_NAME.".
if (filename_lower.find(std::string(kRestrictedNames[i]) + ".") == 0)
return true;
}
for (size_t i = 0; i < arraysize(kRestrictedChars); ++i) {
if (filename.value().find(kRestrictedChars[i]) !=
FilePath::StringType::npos)
return true;
}
return false;
}
std::string FileSystemPathManager::GetStorageIdentifierFromURL(
const GURL& url) {
WebKit::WebSecurityOrigin web_security_origin =
WebKit::WebSecurityOrigin::createFromString(UTF8ToUTF16(url.spec()));
return web_security_origin.databaseIdentifier().utf8();
}
} // namespace fileapi
COMPILE_ASSERT(int(WebFileSystem::TypeTemporary) == \
int(fileapi::kFileSystemTypeTemporary), mismatching_enums);
COMPILE_ASSERT(int(WebFileSystem::TypePersistent) == \
int(fileapi::kFileSystemTypePersistent), mismatching_enums);
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